不可变对象和更新
Immutable Objects & Updates
如果我正在使用一个名为 Name 的不可变 class 来存储人名，并且有人想要更改他们的名字，那么他们的名字不应该被更新（基本上删除旧条目并插入新条目）？这似乎与不可变的定义（通过注释）相矛盾，因为更新实体将被忽略。数据库中存储的一个不可变class需要更新怎么办？它不应该映射为 @Immutable 即使它是不可变的 class 吗？
参考说：
When an entity is read-only:
- Hibernate does not dirty-check the entity's simple properties or
single-ended associations;
- Hibernate will not update simple properties
or updatable single-ended associations;
- Hibernate will not update the
version of the read-only entity if only simple properties or
single-ended updatable associations are changed;
它还说：
In some ways, Hibernate treats read-only entities the same as entities
that are not read-only:
- Hibernate cascades operations to associations as defined in the entity
mapping.
- Hibernate updates the version if the entity has a collection
with changes that dirties the entity;
- A read-only entity can be
deleted.
所以，我认为您必须 delete() 实例，而不是自己用新名称再次 save() 它，因为脏检查不会发生在只读实体上。
如果我正在使用一个名为 Name 的不可变 class 来存储人名，并且有人想要更改他们的名字，那么他们的名字不应该被更新（基本上删除旧条目并插入新条目）？这似乎与不可变的定义（通过注释）相矛盾，因为更新实体将被忽略。数据库中存储的一个不可变class需要更新怎么办？它不应该映射为 @Immutable 即使它是不可变的 class 吗？
参考说：
When an entity is read-only:
- Hibernate does not dirty-check the entity's simple properties or single-ended associations;
- Hibernate will not update simple properties or updatable single-ended associations;
- Hibernate will not update the version of the read-only entity if only simple properties or single-ended updatable associations are changed;
它还说：
In some ways, Hibernate treats read-only entities the same as entities that are not read-only:
- Hibernate cascades operations to associations as defined in the entity mapping.
- Hibernate updates the version if the entity has a collection with changes that dirties the entity;
- A read-only entity can be deleted.
所以，我认为您必须 delete() 实例，而不是自己用新名称再次 save() 它，因为脏检查不会发生在只读实体上。